EP1803916B1 - Procédé et système pour la synchronisation - Google Patents

Procédé et système pour la synchronisation Download PDF

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Publication number
EP1803916B1
EP1803916B1 EP05113097A EP05113097A EP1803916B1 EP 1803916 B1 EP1803916 B1 EP 1803916B1 EP 05113097 A EP05113097 A EP 05113097A EP 05113097 A EP05113097 A EP 05113097A EP 1803916 B1 EP1803916 B1 EP 1803916B1
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Prior art keywords
phase
correct
assumed
assumption
engine
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German (de)
English (en)
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EP1803916A1 (fr
Inventor
Anna Pernestål
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Scania CV AB
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Scania CV AB
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Priority to EP05113097A priority Critical patent/EP1803916B1/fr
Priority to DE602005013104T priority patent/DE602005013104D1/de
Priority to AT05113097T priority patent/ATE424505T1/de
Publication of EP1803916A1 publication Critical patent/EP1803916A1/fr
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/009—Electrical control of supply of combustible mixture or its constituents using means for generating position or synchronisation signals
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/009—Electrical control of supply of combustible mixture or its constituents using means for generating position or synchronisation signals
    • F02D2041/0092—Synchronisation of the cylinders at engine start
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
    • F02D2200/1012—Engine speed gradient

Definitions

  • the present invention relates to a method for synchronization or allocation of cylinders to the crankshaft position in a multi-cylinder internal combustion engine having a crankshaft which rotates twice per working cycle as well as a system for such synchronization according to the preamble of the independent system claim.
  • the invention is applicable to any type of multi-cylinder internal combustion engines being of the so-called four stroke type.
  • the engine may be arranged to drive a vehicle, but the invention is not restricted to that use.
  • camshaft rotates in internal combustion engines of this type one revolution (a working cycle) when the crankshaft carries out two revolutions, so that the stroke in question would be unambiguously determined for each cylinder would the position of the camshaft be known.
  • camshaft sensors are for cost reasons not always arranged in these engines and even if the engine has such a sensor it may fail.
  • the European patent 0 942 163 B1 describes a method, in which the position of the crankshaft of the engine is sensed and a command to inject fuel into one of the cylinders of the engine is ordered as the piston thereof is close to an upper dead centre position and this piston may be in the compression stroke, whereupon the rotational speed of the crankshaft is measured before said ordered injection and with a delay after said injection and a comparison of these two rotational speed values is carried out. If there is an increase in rotational speed it is determined that the phase assumed was correct and if not a new preliminary synchronization takes place by ordering an injection of fuel for the cylinder then assumed to be in the compression stroke when having the piston thereof in said upper dead centre position. This preliminary synchronization is verified if there is an increase in rotational speed.
  • FR 2 853 935 describes a method of synchronizing cylinders with respect to the position of the crankshaft in a multi-cylinder internal combustion engine, in which a test injection of fuel is made in a plurality of cylinders, which are assumed to be in the compression phase, and the rotational speed of the engine shaft is measured after that. If this speed exceeds a predetermined value it is assumed that the assumption with respect to the compression phase was correct. This procedure is repeated for confirming that the assumption was correct. However, if no increase of the rotational speed of the engine above the threshold value indicated takes place it is assumed that the assumption was erroneous and an injection of fuel is carried out in a number of cylinders when these are in a phase earlier assumed to be the exhaust phase.
  • the object of the present invention is to reduce the number of incorrect or erroneous injections of a method for a synchronization or allocation of cylinders to the crankshaft position in a multi-cylinder internal combustion engine.
  • step of fuel injection and rotational speed measurements and comparisons is repeated also if no increase of the rotational speed after said injection above a predetermined level is detected after the first injection of fuel into one of the cylinders, since this does not automatically mean that the phase assumption was false (it is in most cases correct), but there may have been some problem to initiate a combustion in the cylinder in question, for example as a consequence of the properties of a certain cylinder or that the engine temperature was low.
  • a certain number of repetitions is carried out in step e) and if after that no indication that the phase assumption was correct has been obtained it is assumed that the phase assumption was incorrect and the steps b) - f) are repeated for the opposite phase, now assumed to be correct, but as soon as one indication that the phase assumption was correct is obtained said certain number of repetitions are carried out in step e) again.
  • this certain number of repetitions which may suitably be 2, 3 or 4, it is avoided that fuel is injected too many times into cylinders not being in the compression stroke and that additional attempts to obtain said predetermined number of indications that the phase assumption was correct is made as soon as a rotational speed increase above said predetermined level has been detected.
  • step d) if, after it has in step d) obtained an indication that the phase assumption was correct, a further such indication is not obtained after a fixed number of repetitions of steps b) - d) it is assumed that the phase assumption was incorrect and the steps b) - f) are repeated for the opposite phase, now assumed to be correct.
  • this fixed number is 1, which means that it is not only necessary to obtain two indications that the phase assumption was correct for verifying the synchronization, but one such indication has to be directly followed by another such indication.
  • said predetermined number is 2, 3 and 4, which are suitable figures for reliably determining the phase of the engine.
  • the temperature of the engine or a parameter associated therewith is measured before the first fuel injection in step b) and the number of repetitions carried out in step e) is made dependent upon this temperature measurement, so that the number of repetitions is increased with decreasing engine temperature.
  • the engine temperature is very low there is a considerable risk that fuel is injected into one cylinder without obtaining any combustion, and it is therefore preferred to carry out more injections for the phase assumed to be correct under such conditions, since said phase assumption is, as said, mostly correct.
  • said temperature there is a risk of unnecessary changing the assumed phase to the false phase and injecting fuel into the cylinders in the false phase and procuring unnecessary wear or damage. It would also take longer time to start the motor.
  • said predetermined level for the increase of the rotational speed of the crankshaft is set to be at least 5% of the rotational speed before the fuel injection in question.
  • said predetermined level for the increase of the rotational speed is lowered after an exceeding thereof has been detected for the first time in a step d).
  • the first "real" combustion i.e. the first combustion in a compression stroke of that cylinder, results in a greater increase of the rotational speed than combustions following thereupon, so that the predetermined level may initially be set higher for further reducing the risk of recording a combustion as a consequence of fuel injection into the cylinder being in the gas exchange stroke as a combustion in the compression stroke of the cylinder.
  • step b) when step b) is carried out the second time for an assumed phase of the engine, fuel is injected into another cylinder than the preceding time.
  • fuel is injected into another cylinder than the preceding time.
  • One advantage of this procedure is that if it is difficult to obtain combustion in one cylinder in spite of fuel injected into the cylinder in the compression stroke thereof a combustion detected as a "real" combustion may then be obtained in said other cylinder, so that the assumed phase will not be unnecessarily changed.
  • One of the cylinders may also for any other reason behave differently than the other cylinders, and it is then appropriate to make a " test injection" of fuel into different cylinders.
  • the delay between the two injections may be reduced if fuel is injected into another cylinder the second time than the first time, so that the entire synchronization procedure may be shortened.
  • step b) when the step b) is carried out the second time for an assumed engine phase, fuel is injected into the next cylinder assumed to arrive at said compression stroke after the cylinder into which fuel has previously been injected.
  • the synchronization procedure may be shortened to an optimum, and it means for a six cylinder engine that fuel is injected into said other cylinder when the crankshaft has rotated 120° and for an eight cylinder 90° after the preceding injection.
  • step e) fuel is in step b) each time injected into the cylinder being the next to arrive at the compression stroke according to the assumed phase of the engine after the cylinder into which fuel has previously been injected.
  • step f) when it is in step f) assumed that the phase assumption was incorrect and the steps b)-f) are repeated for the opposite phase, now assumed to be correct, fuel is in step b) first injected into the next cylinder arriving at the compression stroke according to the engine phase now assumed, which reduces the duration of the method.
  • step f) when it is in step f) assumed that the phase assumption was incorrect and the steps b)-f) are repeated for the opposite phase, now assumed to be correct, fuel is in step b) first injected into another cylinder than the cylinder started with after step a). This is done for avoiding any false conclusions as a consequence of an inappropriate function of a cylinder of the engine.
  • said repetitions are in step e) carried out during a predetermined period of time dependent upon the present rotational speed of the crankshaft.
  • it is the number of repetitions that is essential, so that a period of time during which said repetitions are carried out is made dependent upon the number of revolutions of the crankshaft, since less time is needed for a certain number of repetitions and the entire method when the number of revolutions of the crankshaft is higher.
  • the method is carried out on an engine of a vehicle, such a truck or a bus.
  • the method according to the invention is suitable to be carried out by means of a computer program, and the invention does for that sake also relate to a computer program loadable directly into the internal memory of a computer, which computer program comprises computer program code for causing the computer to carry out the steps according to the appended computer program claims.
  • the invention also relates to a computer program product comprising a data storage medium readable by an electronic control unit, a computer program according to the invention being stored on said data storage medium, as well as an electronic control unit comprising an execution means, a memory connected to the execution means and a data storage medium connected to the execution means, a computer program according to the invention being stored on said data storage medium.
  • Fig 1 is a very schematic view illustrating the general construction of an embodiment of a system according to the present invention
  • Figs 2-5 are graphs illustrating the rotational speed of the crankshaft of a six cylinder internal combustion engine versus the angle of rotation of the crankshaft when a method for synchronization according to embodiments of the invention is carried out and how information about this speed is used for synchronization of the engine,
  • Fig 6 schematically illustrates an electronic control unit according to the present invention
  • Fig 7 is a flow chart illustrating the principles of a method according to the present invention.
  • Fig 1 schematically illustrates a crankshaft 1 or a flywheel of a six cylinder internal combustion engine having a disc 2 rigidly connected thereto and provided with a plurality of angle marks 3 as well as a reference mark 4.
  • the system comprises at least one sensor 5 adapted to continuously sense the position of the crankshaft rotating twice per working cycle of the engine.
  • Information about the position of the crankshaft and thereby of the piston of each of the cylinders is sent to a control device 6 including an electronic control unit 7.
  • Data concerning in which phase the engine was when previously stopped are stored in the control device.
  • the control device is adapted to assume that the engine has not been moved since it stopped last time and will assume that the engine is in the same phase as when stopped.
  • the system also comprises means 8 adapted to measure a parameter associated with the temperature of the engine and deliver information about this parameter to the control device 6.
  • the control device may by means of the electronic control unit control injecting means 9-14 to inject fuel into the cylinders 15-20 of the engine when the cylinder in question is determined by the sensor 5 to be close to the upper dead centre position and according to said assumed phase in the compression stroke.
  • the method for synchronization or allocation of cylinders to the crankshaft position in the six cylinder internal combustion engine schematically shown in Fig 1 is carried out when the engine is started by the start motor and the number of revolutions will be in the region of 200 revolutions per minute as follows: the existing phase of the engine, i.e. the existing number, first or second, of the rotation of the crankshaft in the existing working cycle is assumed by means of data stored in the memory of the control device 6. Fuel is then injected into one of the cylinders 15-20 as the piston thereof is close to an upper dead centre position and this piston according to said assumed phase is in the compression stroke.
  • the rotational speed of the crank shaft is measured by means of information from said sensor 5 before said injection and with a delay after said injection, such as when the crankshaft has rotated 120° - then in the form of the average rotational speed between the 0°- and the 120°-position. These two rotational speed values are compared in said control device. If the result of said comparison shows an increase of said rotational speed after said injection above a predetermined level n diff , it is decided that there is an indication that the phase assumption was correct and otherwise that it was false.
  • Fuel is now injected into another or the same cylinder as the piston thereof is close to an upper dead centre position and this piston according to said assumed phase is in the compression stroke, whereupon the rotational speed of the crankshaft is measured again and compared with the rotational speed of the crankshaft before the last injection for revealing if the increase of the rotational speed is above a predetermined level.
  • This procedure may be repeated for one or more further cylinders or it may be stopped after two cylinders.
  • the number of said indications that the phase assumption was correct is after each such repetition compared with a predetermined number being at least two and if it is equal to this predetermined number said assumed phase is accepted as correct and the synchronization is verified and the procedure terminated, so that the electronic control unit may start to control the engine according to an algorithm of normal control functions as soon as the engine has reached a normal number of revolutions. It may then also be required that two or three such indications follow directly upon each other for verifying the synchronization.
  • the number of indications that the phase assumption was correct is below said predetermined number it is assumed that the phase assumption was incorrect and fuel is injected into one of the cylinders as the piston thereof is close to an upper dead centre position and this piston according to said phase, now assumed to be correct, is in the compression stroke, whereupon the above procedure is repeated for this assumed phase.
  • the assumed phase may in this way be changed a certain number of times.
  • a certain number of repetitions i.e. injections of fuel into cylinders, is carried out, corresponding to a time lapsed from the first injection of t first -thershold, and if after that no indication that the phase assumption was correct has been obtained it is assumed that the phase assumption was incorrect, but as soon as one indication that the phase assumption was correct is obtained said certain number of repetitions are carried out again.
  • the control device 6 may make said certain number or repetitions and said fixed number of further number of repetitions dependent upon the temperature of the engine reported by the sensor 8 and increase the number of repetitions with decreasing engine temperature, since the risk is higher when the engine temperature is low that a combustion will not take place in a cylinder in spite of injection of fuel thereinto in the compression stroke thereof.
  • Figs 2-5 schematically illustrate the development of the rotational speed of the crankshaft in the form of the number of revolutions per minute versus the angle of rotation of said crankshaft when applying a method according to different embodiments of the invention upon a six cylinder internal combustion engine.
  • An angle of 120° corresponds to the position of the crankshaft when fuel is the first time in step b) injected into a cylinder after the assumption of the existing phase of the engine.
  • Fig 2 illustrates the case in which the assumption of phase 1 as existing phase was correct and the rotational speed does after said first injection show an increase above a predetermined level n diff , such as above 5 percent of the rotational speed before that injection.
  • This predetermined level may for some engines be set slightly higher, such as at 7 or 10 percent of the rotational speed before the injection. This means an indication that the phase assumption was correct.
  • Fig 3 shows a case in which the initial engine phase 1 assumption is false and no increase of the rotational speed above a predetermined level is observed after injection of fuel in the first cylinder, whereupon fuel is also injected into the next two cylinders arriving at the compression stroke according to the assumed phase, but these injections do neither result in any increase of the rotational speed above said predetermined level.
  • Said certain number of repetitions is here by dimensioning t first -threshold set to three, so that it is then assumed that the phase assumption was incorrect, and fuel is then at the position of 360° of the crankshaft injected into a cylinder assumed to be in the compression stroke in the phase 2 now assumed to be correct, such as the first cylinder instead of the fourth cylinder.
  • This injection results in an increase of the rotational speed above said predetermined level n diff , and this injection is followed by two further injections into the next cylinder with the same result, whereupon the synchronization is verified and the procedure terminated.
  • Fig 4 illustrates the case in which the first assumption with respect to the engine phase 1 is correct, but for any reason no combustion takes place in the first cylinder into which fuel is injected. However, it is then not assumed that the phase assumption was incorrect, but fuel is as in the procedure according to Fig 3 injected into the next cylinder arriving at the assumed compression stroke and an increase of the rotational speed above said predetermined level n diff is observed.
  • said predetermined number is set to be three, and the synchronization is verified and the procedure terminated after having observed three said increases of the rotational speed above said predetermined level.
  • Fig 5 illustrates the case of an incorrect first assumption of the existing phase of the engine, which however for any reason results in an increase of the rotational speed of the crankshaft above said predetermined level n diff .
  • the next injection does not result in any rotational speed increase above n diff (n diff is in fact negative at 240°, but this has not been shown in Fig 5 ), so that t between two possible combustions is reaching t between -treshold and it is then assumed that the phase assumption was incorrect and the procedure is repeated for the opposite phase 2, now assumed to be correct, resulting in an acceptance of that phase to be correct.
  • n diff is in fact negative at 240°, but this has not been shown in Fig 5
  • t between two possible combustions is reaching t between -treshold and it is then assumed that the phase assumption was incorrect and the procedure is repeated for the opposite phase 2, now assumed to be correct, resulting in an acceptance of that phase to be correct.
  • Computer program code for implementing the method according to the invention is suitably included in a computer program, which is loadable directly into the internal memory of a computer, such as the internal memory of the electronic control unit 7 of a vehicle.
  • a computer program is suitably provided with a computer program product comprising a data storage medium readable by an electronic control unit, which data storage medium has the computer program stored thereon.
  • Said data storage medium is for instance an optical data storage medium in the form of a CD-ROM disc, a DVD disc etc., a magnetic data storage medium in the form of a hard disc, a diskette, a cassette tape etc., or a memory of the type ROM, PROM, EPROM or EEPROM of a Flash memory.
  • the computer program comprises computer program code for causing a computer, e.g. in the form of a micro processor of an electronic unit such as an engine control unit: a) to assume or receive an assumption of the existing phase of a multi-cylinder internal combustion engine having a crankshaft which rotates twice per working cycle, i.e. the first or second rotation in a working cycle,
  • Fig 6 very schematically illustrates an electronic control unit 6 comprising an execution means 21, such a central processing unit (CPU), for executing computer software.
  • the execution means 21 communicates with a memory 23, for instance of the type RAM, via a data bus 22.
  • the control unit 6 also comprises data storage medium 24, for instance in the form of a memory of the type ROM, PROM, EPROM or EEPROM or a Flash memory.
  • the execution means 21 communicates with the data storage medium 24 via the data bus 22.
  • a computer program comprising computer program code for implementing a method according to the invention is stored on the data storage medium 24.
  • Fig 7 shows a flow chart of a method according to an embodiment of the present invention comprising the steps S1-S10.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Circuits Of Receivers In General (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Claims (25)

  1. Procédé de synchronisation ou d' affectation de cylindres (15-20) à la position du vilebrequin dans un moteur à combustion interne multicylindre comportant un vilebrequin (1) qui tourne deux fois par cycle de travail, dans lequel la position du vilebrequin est détectée en continu ou quand on le souhaite, le procédé étant réalisé quand le moteur est démarré et comprenant les étapes suivantes :
    a) la phase existante du moteur, c'est-à-d ire le numéro existant, premier ou second, de la rotation du vilebrequin dans le cycle de travail existant est supposée,
    b) du carburant est injecté dans l'un desdits cylindres alors que le piston de celui-ci est près d'une position de point mort supérieure et que ce piston selon ladite phase supposée est dans la course de compression,
    c) la vitesse de rotation du vilebrequin est mesurée avant ladite injection et après ladite injection, mais avant que du carburant soit injecté dans le cylindre suivant, et une comparaison de ces deux valeurs de la vitesse de rotation est effectuée,
    d) si le résultat de ladite comparaison montre une augmentation de ladite vitesse de rotation après ladite injection au-dessus d'un niveau prédéterminé, il est décidé qu'il y a une indication selon laquelle la supposition de phase en a) était correcte et dans le cas contraire qu'elle était fausse,
    e) une ou plusieurs répétitions des étapes b) - d) sont réalisées,
    f) après chacune desdites répétitions, le nombre desdites indications selon lesquelles la supposition de phase était correcte, est comparé à un nombre prédéterminé qui est au moins deux et, s'il est égal à ce nombre prédéterminé, ladite phase supposée est acceptée comme étant correcte et la synchronisation est vérifiée et la procédure terminée et, si après la dernière de ladite ou desdites répétitions le nombre d'indic ations selon lesquelles la supposition de phase était correcte est inférieur audit nombre prédéterminé, il est supposé que la supposition de phase était incorrecte et les étapes b) - f) sont répétées pour la phase opposée, maintenant supposée être correcte, la phase supposée pouvant de cette manière être modifiée un certain nombre de fois.
  2. Procédé selon la revendication 1,
    caractérisé en ce que dans l' étape e) un certain nombre de répétitions sont réalisées et si après cela aucune indication selon laquelle la supposition de phase était correcte n' a été obtenue, il est supposé que la supposition de phase était incorrecte et les étapes b) - f) sont répétées pour la phase opposée, maintenant supposée être correcte, mais dès qu'une indication selon laquelle la supposition de phase était correcte est obtenue, ledit certain nombre de répétitions sont réalisées dans l'étape e) de nouveau.
  3. Procédé selon la revendication 2,
    caractérisé en ce que ledit certain nombre est 2, 3 ou 4.
  4. Procédé selon l'u ne quelconque des revendications 1-3, caractérisé en ce que si, après l'obtention dans l'étape d) d'une indication selon laquelle la supposition de phase était correcte, une autre indication en ce sens n'est pas obtenue après un nombre fixe de répétitions des étapes b) - d), il est supposé que la supposition de phase était incorrecte et les étapes b) - f) sont répétées pour la phase opposée, maintenant supposée être correcte.
  5. Procédé selon la revendication 4,
    caractérisé en ce que ledit nombre fixe est 1.
  6. Procédé selon l'une quelconque des revendications précédentes,
    caractérisé en ce que ledit nombre prédéterminé est 2, 3 ou 4.
  7. Procédé selon l'une quelconque des revendications précédentes,
    caractérisé en ce que la température du moteur ou un paramètre qui y est associé est mesurée avant la première injection de carburant dans l'étape b) et le nombre de répétitions réalisées dans l'étap e e) est rendu dépendant de cette mesure de température, de sorte que le nombre de répétitions est augmenté à mesure que la température du moteur décroît.
  8. Procédé selon l'une quelconque des revendications précédentes,
    caractérisé en ce que ledit niveau prédéterminé pour l'augment ation de la vitesse de rotation du vilebrequin est réglé pour être d' au moins 5 % de la vitesse de rotation avant l'inje ction de carburant en question.
  9. Procédé selon la revendication 8,
    caractérisé en ce que ledit niveau prédéterminé pour l'augment ation de la vitesse de rotation est abaissé après qu'u n dépassement de celui-ci a été détecté pour la première fois dans une étape d).
  10. Procédé selon l'une quelconque des revendications précédentes,
    caractérisé en ce que, quand l' étape b) est réalisée la seconde fois pour une phase supposée du moteur, du carburant est injecté dans un autre cylindre que celui de la fois précédente.
  11. Procédé selon la revendication 10,
    caractérisé en ce que, quand l' étape b) est réalisée la seconde fois pour une phase supposée du moteur, du carburant est injecté dans le cylindre suivant supposé arriver à ladite course de compression après le cylindre dans lequel du carburant a précédemment été injecté.
  12. Procédé selon la revendication 11,
    caractérisé en ce que du carburant est injecté dans ledit autre cylindre quand le vilebrequin a tourné de 120° pour un moteur à six cylindres et de 90° pour un moteur à huit cylindres après l'injection précédente.
  13. Procédé selon l'une quelconque des revendications précédentes,
    caractérisé en ce que dans l'étap e e) au moins deux répétitions sont réalisées et en ce que dans l'étap e b) du carburant est à chaque fois injecté dans le cylindre qui est le suivant à arriver à la course de compression selon la phase supposée du moteur après le cylindre dans lequel du carburant a précédemment été injecté.
  14. Procédé selon l'une quelconque des revendications précédentes,
    caractérisé en ce que, quand dans l'étape f) il est supposé que la supposition de phase était incorrecte et que les étapes b) - f) sont répétées pour la phase opposée, maintenant supposée être correcte, du carburant est dans l'étape b) d'a bord injecté dans le cylindre suivant arrivant à la course de compression selon la phase du moteur maintenant supposée.
  15. Procédé selon l'u ne quelconque des revendications 1-13,
    caractérisé en ce que, quand dans l'é tape f) il est supposé que la supposition de phase était incorrecte et que les étapes b) - f) sont répétées pour la phase opposée, maintenant supposée être correcte, du carburant est dans l'étap e b) d'abor d injecté dans un autre cylindre que le cylindre par lequel on a commencé après l'étape a).
  16. Procédé selon l'une quelconque des revendications précédentes,
    caractérisé en ce que lesdites répétitions sont dans l'éta pe e) réalisées pendant un laps de temps prédéterminé dépendant de la vitesse de rotation présente du vilebrequin.
  17. Procédé selon l'une quelconque des revendications précédentes,
    caractérisé en ce qu'il est réalisé sur un moteur de véhicule, tel qu'un camion ou un bus.
  18. Système de synchronisation ou d'affectation de cylindres (15-20) à la position du vilebrequin dans un moteur à combustion interne multicylindre comportant un vilebrequin (1) qui tourne deux fois par cycle de travail, le système comprenant :
    - des moyens (5) aptes à détecter la position du vilebrequin,
    - des moyens (S5) aptes à commander des moyens d'inj ection (9-14) pour injecter du carburant dans l'un desdits cylindres alors que le piston de celui-ci selon les moyens de détection est près d'un e position de point mort supérieure et que ce piston selon une supposition de la phase du moteur est dans la course de compression,
    - des moyens aptes à mesurer la vitesse de rotation du vilebrequin avant ladite injection et après ladite injection mais avant que du carburant soit injecté dans le cylindre suivant,
    - des premiers moyens aptes à comparer lesdites deux valeurs de la vitesse de rotation et décider qu'il y a une indication selon laquelle la supposition de phase était correcte si le résultat de ladite comparaison montre une augmentation de ladite vitesse de rotation après ladite injection au-dessus d'un niveau prédéterminé et dans le cas contraire qu'elle était fausse,
    caractérisé en ce qu' il comprend en outre :
    - un dispositif de commande (6) apte à commander lesdits moyens de commande, lesdits moyens mesurant la vitesse de rotation et lesdits premiers moyens de comparaison pour répéter ladite procédure d'inj ection de carburant, de mesure de la vitesse de rotation et de comparaison une ou plusieurs fois, et
    - des seconds moyens (S7) pour comparer, après chaque répétition de ladite procédure, le nombre desdites indications selon lesquelles la supposition de phase était correcte à un nombre prédéterminé qui est au moins deux,
    et en ce que ledit dispositif de commande est apte à terminer la procédure et à considérer que la synchronisation est vérifiée si ledit nombre d'indicatio ns selon lesquelles la supposition de phase était correcte, est égal audit nombre prédéterminé et si après la dernière de ladite ou desdites répétitions, le nombre d'indic ations est inférieur audit nombre prédéterminé pour commander lesdits moyens de commande, lesdits moyens mesurant la vitesse de rotation et lesdits premiers et seconds moyens de comparaison pour réaliser ladite procédure d'injection de carburant, de mesure de la vitesse de rotation et de comparaison deux fois ou plus pour une supposition selon laquelle la phase opposée à la phase précédemment supposée correcte est la phase correcte.
  19. Système selon la revendication 18,
    caractérisé en ce qu'il comprend des moyens (8) aptes à mesurer la température du moteur avant la première injection de carburant, et en ce que ledit dispositif de commande (6) est apte à rendre le nombre de répétitions de ladite procédure dépendant de la température du moteur en augmentant le nombre de répétitions pour une température du moteur décroissante.
  20. Système selon la revendication 18 ou 19,
    caractérisé en ce que lesdits premiers moyens de comparaison (S5) sont aptes à décider qu'i l y a une indication selon laquelle la supposition de phase était correcte si l'augment ation de la vitesse de rotation du vilebrequin est supérieure à un niveau prédéterminé réglé au moins à 5 % de la vitesse de rotation avant l'inje ction de carburant en question.
  21. Programme d'ordinateur chargeable directement dans la mémoire interne d'un ordinateur, lequel programme d'ordinate ur comprend un code de programme d'ordin ateur pour faire que l'or dinateur :
    a) suppose ou reçoive une supposition de la phase existante d' un moteur à combustion interne multicylindre comportant un vilebrequin qui tourne deux fois par cycle de travail, c'est-à-dir e la première ou seconde rotation dans un cycle de travail,
    b) commande l'inje ction de carburant dans l'un desdits cylindres alors que le piston de celui-ci est près d'un e position de point mort supérieure et que ce piston selon ladite phase supposée est dans la course de compression,
    c) mesure la vitesse de rotation du vilebrequin avant ladite injection et après ladite injection, mais avant que du carburant soit injecté dans le cylindre suivant, et compare ces deux valeurs de la vitesse de rotation,
    d) décide qu'il y a une indication selon laquelle la supposition de phase en a) était correcte si le résultat de ladite comparaison montre une augmentation de ladite vitesse de rotation après ladite injection au-dessus d'un niveau prédéterminé et dans le cas contraire qu'elle était fausse,
    e) commande les étapes b) - d) pour qu' elles soient répétées une ou plusieurs fois,
    f) compare après chacune desdites répétitions dans l'étape e) le nombre desdites indications selon lesquelles la supposition de phase était correcte à un nombre prédéterminé qui est au moins deux et s'il est égal à ce nombre prédéterminé accepte ladite phase supposée comme étant correcte et vérifie une synchronisation des cylindres du moteur et termine la procédure et, si après la dernière de ladite ou desdites répétitions, le nombre d'indi cations selon lesquelles la supposition de phase était correcte est inférieur audit nombre prédéterminé, suppose que la supposition de phase était incorrecte et répète les étapes b) - f) pour la phase opposée, maintenant supposée être correcte,
    et modifie la phase supposée de cette manière de façon maximale un certain nombre de fois.
  22. Programme d'or dinateur selon la revendication 21,
    caractérisé en ce que le programme d'or dinateur comprend un code de programme d' ordinateur pour faire que l'o rdinateur :
    - réalise dans l'étape e) un certain nombre de répétitions et, si aucune indication selon laquelle la supposition de phase était correcte n' a été obtenue, suppose que la supposition de phase était incorrecte et répète les étapes b) - f) pour la phase opposée, maintenant supposée être correcte, mais dès qu'un e indication selon laquelle la supposition de phase était correcte est obtenue, réalise de nouveau ledit certain nombre de répétitions dans l' étape c).
  23. Programme d'or dinateur selon la revendication 21 ou 22,
    caractérisé en ce que le programme d'or dinateur comprend un code de programme d' ordinateur pour faire que l'o rdinateur :
    - détermine ou reçoive une valeur de température représentant la température actuelle du moteur, et
    - rende le nombre de répétitions réalisées dans l'ét ape e) dépendant de ladite valeur de température du moteur, de sorte que le nombre de répétitions augmente pour une température du moteur décroissante.
  24. Produit programme d'ordinat eur comprenant un support de stockage de données pouvant être lu par une unité de commande électronique, un programme d'ordinat eur selon l'une quelconque des revendications 21-23 étant stocké sur ledit support de stockage de données.
  25. Unité de commande électronique comprenant des moyens d'exé cution, une mémoire raccordée aux moyens d'e xécution et un support de stockage de données raccordé aux moyens d'e xécution, un programme d'or dinateur selon l'u ne quelconque des revendications 21-23 étant stocké sur ledit support de stockage de données.
EP05113097A 2005-12-30 2005-12-30 Procédé et système pour la synchronisation Active EP1803916B1 (fr)

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DE602005013104T DE602005013104D1 (de) 2005-12-30 2005-12-30 System und Verfahren zur Synchronisierung
AT05113097T ATE424505T1 (de) 2005-12-30 2005-12-30 System und verfahren zur synchronisierung

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FR2925593B1 (fr) * 2007-12-20 2014-05-16 Renault Sas Procede pour produire un signal de synchronisation du cycle de fonctionnement d'un moteur a combustion interne
SE534427C2 (sv) * 2008-06-18 2011-08-16 Scania Cv Ab Metod och system för att bestämma fasen hos en fyrtakts förbränningsmotor
JP4801184B2 (ja) 2009-04-20 2011-10-26 本田技研工業株式会社 汎用内燃機関の点火制御装置
FR2950393B1 (fr) * 2009-09-24 2012-02-24 Peugeot Citroen Automobiles Sa Procede de determination du cycle d'un moteur a cylindres impair
CN103244299A (zh) * 2013-04-28 2013-08-14 绵阳新晨动力机械有限公司 一种转速梯度增量阀值判缸方法
CN105452634B (zh) * 2013-08-19 2018-12-21 罗伯特·博世有限公司 一种控制燃料喷射系统的方法及其装置

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* Cited by examiner, † Cited by third party
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EP1050676A3 (fr) * 1999-05-05 2002-06-05 Delphi Technologies, Inc. Indicateur de position de moteur à combustion interne
US6571776B1 (en) * 2000-09-08 2003-06-03 General Electric Company Cam sensor elimination in large four stroke compression-ignition engines
FR2853935B1 (fr) * 2003-04-17 2007-03-02 Siemens Vdo Automotive Procede de synchronisation de l'injection avec la phase moteur dans un moteur a commande electronique des injecteurs

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